Influenza — Worldwide/Unknown
During the 2012-13 influenza season in the United States, influenza activity increased through November and December [2012] before peaking in late December [2012]. Influenza A(H3N2) viruses predominated overall, but influenza B viruses and, to a lesser extent, influenza A(H1N1)pdm09 (pH1N1) viruses also were reported in the US. This influenza season was moderately severe, with a higher percentage of outpatient visits for influenza-like illness (ILI), higher rates of hospitalization, and more
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